exam Maths Puzzle Numerical Ability

Candy and Tim share a paper route. It takes Candy 30 min to deliver all the papers, and it takes Tim 90 min. How long does it take the two when they work together?

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Please help me with this question.

X 1 3 6
Y 3 9 t

The table above shows a relation of the form y = kx^ + c where k and c are constants.

calculate the value of t. An airplane took 2 hours to fly 600km against a head wind. The return trip with the wind took 1 2/3 hours. Find the speed of the plane in still air.